Transformers MCQs
1. What is the primary function of a transformer?
Answer: b) Change voltage levels while keeping power constant
2. A transformer works on the principle of:
Answer: d) Both a) and c)
3. The core of a transformer is laminated to reduce:
Answer: c) Eddy current loss
4. Which type of transformer is used to step up voltage?
Answer: a) Step-up transformer
5. The turns ratio of a transformer is 1:2. If the primary voltage is 220V, the secondary voltage will be:
Answer: b) 440V
6. In an ideal transformer, the input power is:
Answer: c) Equal to output power
7. Which losses in a transformer are collectively called "copper losses"?
Answer: b) I²R losses in windings
8. The efficiency of a transformer is maximum when:
Answer: a) Copper loss = Iron loss
9. The purpose of a breather in a transformer is to:
Answer: b) Absorb moisture from air
10. Which type of transformer has only one winding?
Answer: c) Auto-transformer
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All FOUR PAPERS ELECTRICAL SUPERVISOR STUDY MATERIAL
ELECTRICAL SUPERVISOR BOOK
MADHYA PRADESH
ELECTRICAL SUPERVISOR EXAM MP
“This book covers the All paper of the Electrical Supervisor Exam, along
with previous years’ question papers (PYQs) for all four papers. It includes
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